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Why social philosophy? A debate A number of authors now invoke the opposition between political philosophy and social philosophy, whether to account for the specific nature of Marx’s relation to philosophy or to reactualize the project of a critical theory of society. What, the article asks, is the meaning of this distinction ? Can it fulfill the requisite conditions that will enable philosophers to address in a pertinent manner the social and political challenges of our time ? These are the questions addressed here by Catherine Colliot-Thélène, whose fear is that the distinction in question may lose sight of the crucial question of power, and by Franck Fischbach, who emphasizes the materialist orientation of an approach that seeks to address the political from the perspective of the social.